Destruction of pollutants in water with ozone in combination with ultraviolet radiation.  II.  Natural trihalomethane precursors

Glaze, William H.; Peyton, Gary R.; Lin, Simon H.; Huang, Rong; Burleson, Jimmie L.

doi:10.1021/es00102a005

Cited by 111 publications

(39 citation statements)

References 7 publications

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“…28−32 Morin is a textile dye with a flavonoid backbone, which was found to break down under the oxidation of ambient oxygen with catalysis of visible light. 28 Grosjean et al 29 reported the fading 28 and electrochemical oxidation of azo dye C.I. Reactive Yellow 3.…”

Section: ■ Literature Reviewmentioning

confidence: 99%

Ozonation-Based Decolorization of Food Dyes for Recovery of Fruit Leather Wastes

Wen-da

Kozieł

Cai

et al. 2013

J. Agric. Food Chem.

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Commercial manufacture of fruit leathers (FL) usually results in a portion of the product that is out of specification. The disposition of this material poses special challenges in the food industry. Because the material remains edible and contains valuable ingredients (fruit pulp, sugars, acidulates, etc.), an ideal solution would be to recover this material for product rework. A key practical obstacle to such recovery is that compositing of differently colored wastes results in an unsalable gray product. Therefore, a safe and scalable method for decolorization of FL prior to product rework is needed. This research introduces a novel approach utilizing ozonation for color removal.To explore the use of ozonation as a decolorization step, we first applied it to simple solutions of the commonly used food colorants 2-naphthalenesulfonic acid (Red 40), tartrazine (Yellow 5), and erioglaucine (Blue 1). Decolorization was measured by UV/vis spectrometry at visible wavelengths and with a Hunter colorimeter. Volatile and semivolatile byproducts from ozone-based colorant decomposition were identified and quantified with solid phase microextraction coupled with gas chromatography-mass spectrometry (SPME-GC-MS). Removal of Yellow 5, Red 40 and Blue 1 of about 65%, 80%, and 90%, respectively, was accomplished with 70 g of ozone applied per 1 kg of redissolved and resuspended FL. Carbonyl compounds were identified as major byproducts from ozone-induced decomposition of the food colorants. A conservative risk assessment based on quantification results and published toxicity information of potentially toxic byproducts, determined that ozone-based decolorization of FL before recycling is acceptable from a safety standpoint. A preliminary cost estimate based on recycling of 1000 tons of FL annually suggests a potential of $275,000 annual profit from this practice at one production facility alone. ABSTRACT: Commercial manufacture of fruit leathers (FL) usually results in a portion of the product that is out of specification. The disposition of this material poses special challenges in the food industry. Because the material remains edible and contains valuable ingredients (fruit pulp, sugars, acidulates, etc.), an ideal solution would be to recover this material for product rework. A key practical obstacle to such recovery is that compositing of differently colored wastes results in an unsalable gray product. Therefore, a safe and scalable method for decolorization of FL prior to product rework is needed. This research introduces a novel approach utilizing ozonation for color removal. To explore the use of ozonation as a decolorization step, we first applied it to simple solutions of the commonly used food colorants 2-naphthalenesulfonic acid (Red 40), tartrazine (Yellow 5), and erioglaucine (Blue 1). Decolorization was measured by UV/ vis spectrometry at visible wavelengths and with a Hunter colorimeter. Volatile and semivolatile byproducts from ozone-based colorant decomposition were identified and quantified with solid...

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Section: ■ Literature Reviewmentioning

confidence: 99%

Ozonation-Based Decolorization of Food Dyes for Recovery of Fruit Leather Wastes

Wen-da

Kozieł

Cai

et al. 2013

J. Agric. Food Chem.

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“…The rate constants of DCAA and TCAA decreased by 41.1% and 23.8%, respectively, when humic acids was added at a concentration of 1.2 mg TOC/L as compared to those in the absence of humic acids. From the concentration of humic acids and the reaction rate con- According to Glaze et al [27,28], the following reactions could be expected in the O 3 /UV process: where C HCO 3 is the concentration of HCO 3 − (mmol/L).…”

Section: The Influence Of Humic Acids and Bicarbonate Ionmentioning

confidence: 99%

Decomposition of two haloacetic acids in water using UV radiation, ozone and advanced oxidation processes

Wang

Guo

Yang

et al. 2009

Journal of Hazardous Materials

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“…This species is a powerful oxidant; however due to its high reactivity, it is unstable and must be continuously produced in situ by means of chemical or photochemical reactions. Among the different ways to generate the hydroxyl radicals are: ozone with ultraviolet light (Glaze et al, 1982;Mirat et al, 1997;Esplugas et al, 1994), hydrogen peroxide with ultraviolet light, and photocatalysis, which uses a semi-conductor in combination with UV radiation and molecular oxygen (Weir et al,1993;and Brezova et al,1991). Some of these processes like ozonation are more expensive than the use of a catalyst with UV irradiation.…”

Section: Introductionmentioning

confidence: 99%

The degradation of phenol in water solution by TiO2 photocatalysis in a helical reactor

2013

Global NEST Journal

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Heterogeneous photocatalysis is an advanced oxidation process (AOP) which has been widely studied by numerous researchers in the world and is used to degrade or remove a wide range of pollutants in water and air. The photocatalytic oxidation and mineralization of phenol in aqueous catalyst suspensions of titanium dioxide (TiO2) Degussa P25 (80% anatase, 20% rutile) has been carried out in a helical reactor. The photodegradation was investigated using two kinds of high pressure mercury irradiation lamps one emitting at 254 nm (15 Watts) and the other emitting at 365 nm (400 Watts). The effects of the recirculation flow, source of withdrawal, initial phenol concentration, amount of catalyst, suspension pH and light intensity on photodegradation of phenol were investigated. These parameters were studied to find the optimal conditions for a complete and fast oxidation of this organic compound. Kinetic experiments were performed at 32 oC over a range of phenol concentrations from 2.5 to 25 mg l-1, a range of TiO2 concentrations from 0.1 to 1 g l1, a range of suspensions pH from 3 to 9. The helical reactor was operated under a continuous flow-mode. Results showed that photodegradation is an effective method for the removal of phenol from wastewaters. The efficiency of the process depends strongly on the experimental conditions. The amount of catalyst, UV irradiation time, pH and light intensity were important parameters in the degradation process. The rate constants for the different parameters (TiO2, phenol concentration) were evaluated. Kinetic studies showed that titanium dioxide photocatalyst P25 was very active in phenol degradation; we observed that 99% of pollutant was degraded after 6 hours of UV irradiation; furthermore, we observed that phenol degradation was more effective under acidic conditions than alkaline. The kinetics were described by the Langmuir- Hinshelwood (L-H) kinetic model. An overall pseudo-first order kinetic constant has been calculated for phenol conversion and values obtained in acidic pH are higher than those calculated for basic pH media.

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Destruction of pollutants in water with ozone in combination with ultraviolet radiation. II. Natural trihalomethane precursors

Cited by 111 publications

References 7 publications

Ozonation-Based Decolorization of Food Dyes for Recovery of Fruit Leather Wastes

Ozonation-Based Decolorization of Food Dyes for Recovery of Fruit Leather Wastes

Decomposition of two haloacetic acids in water using UV radiation, ozone and advanced oxidation processes

The degradation of phenol in water solution by TiO2 photocatalysis in a helical reactor

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